Ranger-4 was an experimental model designed by BETA to supplement the spacecraft forces and give the Galaxy Rangers a better fighting chance against the Crown Destroyers and pirate battleships that frequented their patrol regions. This powerful ship contained enough crew capacity for eight people maximum, the remainder of the ship was packed solid with extra shield generators, powerful engines, and devestating pumped laser cells.

The one time this ship went into combat against a larger battleship, it was successful, but was critically damaged in the ensuing battle, and had to be scuttled. After the reports came back of the ship's performance, and also of the downsizing of the defence forces, the design was shelved, and no further models were constructed.